Pick the correct statements:
(a) average speed of a particle in a given time is never less than the magnitude of the average velocity
(b) It is possible to have a situation in which $\left|\frac{d\vec v}{dt}\right|≠ 0$ but $\frac{d|\vec v|}{dt} = 0$
(c) The average velocity of a particle is zero in a time interval. It is possible that the instantaneous velocity is never zero in the interval
(d) The average velocity of a particle moving on a straight line is zero in a time interval. It is possible that the instantaneous velocity is never zero in the interval, (infinite accelerations are not allowed).

a, b

The correct answer is Option (1) → a, b

(a) $\left|\frac{av\, velocity}{av\, speed}\right|≤1$

(b) In circular motion speed is constant $\left(\frac{d|\vec v|}{dt}\right)$ is